EP1205749B1 - Contrôle acoustique de roues aubagées monoblocs - Google Patents

Contrôle acoustique de roues aubagées monoblocs Download PDF

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Publication number
EP1205749B1
EP1205749B1 EP01402600.9A EP01402600A EP1205749B1 EP 1205749 B1 EP1205749 B1 EP 1205749B1 EP 01402600 A EP01402600 A EP 01402600A EP 1205749 B1 EP1205749 B1 EP 1205749B1
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EP
European Patent Office
Prior art keywords
wheel
blade
acoustic
frequency
piece bladed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01402600.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1205749A1 (fr
Inventor
Jacky S. Naudet
Jean-Luc A. Mary
André C. Collot
Marc J. Berthillier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Aircraft Engines SAS
Original Assignee
SNECMA SAS
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Filing date
Publication date
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Publication of EP1205749A1 publication Critical patent/EP1205749A1/fr
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4445—Classification of defects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/01—Indexing codes associated with the measuring variable
    • G01N2291/014—Resonance or resonant frequency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/10—Number of transducers
    • G01N2291/101—Number of transducers one transducer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/26—Scanned objects
    • G01N2291/263—Surfaces
    • G01N2291/2638—Complex surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/26—Scanned objects
    • G01N2291/269—Various geometry objects
    • G01N2291/2693—Rotor or turbine parts

Definitions

  • the present invention relates to the field of control of the machining of mechanical parts and more particularly relates to the frequency control of monobloc bladed wheels by vibro-acoustic signature.
  • turbomachine description the rotating part, or rotor, of the compressor in a turbojet engine or turboprop engine (hereinafter referred to as the turbomachine description), was formed by the assembly of several wheels, in the form of disks or rings, on each of which were reported blades, also called blades. This individual assembly of the vanes had the effect of creating a damping of the vibratory phenomena which, in practice, excluded any resonant destruction of the wheel on which they were mounted.
  • compressor wheels and also industrial fans are more and more often made in one piece, the blades being an integral part of the disc or the support ring. Indeed, this type of structure can minimize the size and weight of the wheel and therefore also that of the compressor as a whole, which has a beneficial influence on the overall mass of the turbine engine that incorporates it.
  • JP 59034146 a method and apparatus for acoustically controlling a bladed wheel is described.
  • the present invention relates to a method and a corresponding device for acoustic control of monobloc bladed wheels which determine this risk of resonance in order to avoid the potential destruction of the wheel.
  • An object of the invention is also to provide a particularly fast control method which can be implemented in real time.
  • Another object of the invention is to provide a control method that can be an integral part of the machining process.
  • Another object of the invention is to provide a method which also allows a control of the quality of machining.
  • Yet another object of the invention is to propose a method which can also determine the type of defects affecting the blades recognized as defective.
  • an acoustic control method of a bladed impeller in which this wheel is rotated; each blade of the wheel is subjected to mechanical excitation, its acoustic response is collected and a corresponding electrical signal is generated; the FFT (Fast Fourier Transform) calculation determines its frequency response; the electrical signal and the associated frequency response are stored; the characteristic frequencies of each blade of the wheel are identified; and rejecting or accepting the wheel according to whether the frequency distribution thus obtained is identical or not to a predetermined set of prohibited frequency distribution.
  • FFT Fast Fourier Transform
  • this particular method it is possible without error and very quickly to discard a non-compliant wheel.
  • this method can easily integrate with a conventional machining process.
  • this method further comprises an additional step of determining the defects of a blade from the comparison of its frequency response with respect to predetermined frequency responses characteristic of typical defects.
  • the invention also relates to the device implementing the aforementioned method.
  • the mechanical excitation means of this device comprise a means of excitation by percussion or release of hammer and the acoustic reception means comprise a microphone.
  • the acoustic control device of one-piece bladed wheels is illustrated very schematically in FIG. figure 1 . It comprises: a means for rotating the wheel 10 constituted for example by an electric motor 12 acting on a hub 14 on which is fixed the wheel to be controlled (an indexing system, not shown, being furthermore provided for locate each blade of the wheel); a mechanical excitation means 16, constituted for example by a percussion device or by releasing hammer (finger or metal strip for example), and placed above a blade 20 of the wheel; an acoustic reception means 18 constituted for example by a microphone placed near the excited blade; and processing means 22-28 connected to both the mechanical excitation means and the acoustic reception means for firstly controlling the mechanical excitation means 16 and secondly processing the acoustic signals collected at the terminals of the acoustic reception means 18. Conventionally, for each blade of the wheel, the processing of the acoustic signals is synchronized with the corresponding excitation signals.
  • the processing means comprise means 22 for transforming the acoustic signals collected into electrical signals.
  • the transformation of the acoustic signals is typically accompanied by a filtering on a determined frequency band and compatible with the wheel to be controlled. These signals are then subjected to an FFT analysis (Fast Fourier Transform) to draw a frequency response of the corresponding dawn.
  • FFT analysis Fast Fourier Transform
  • the electrical signals analyzed (after sampling) as well as the various samples of the resulting frequency response are stored in storage means 24, for example in a digital memory, for each blade of the wheel to be controlled. Note that the determination of the frequency response of each blade and its corresponding storage in the storage means can be performed not between each blade but once collected the acoustic signals of all the blades of the wheel to control.
  • the figure 2 shows an example of the frequency responses obtained for four successive blades of a bladed compressor wheel of a turbomachine and which constitute in a way their acoustic signature.
  • F1, F2, F3 characteristics of the geometry of the studied dawn.
  • the measurement was carried out in a frequency range of 0 to 7000 Hertz with a frequency resolution of 8 Hertz.
  • a processing carried out on the frequency responses of each of the vanes of the wheel to be controlled by identification means 26 then makes it possible to determine the characteristic frequencies of each vane among the different frequencies provided by the previous frequency responses and to then come to the following table: Dawn number Frequency F1 Frequency F2 Frequency F3 1 F1 1 F2 1 F3 1 2 F1 2 F2 2 F3 2 i F1 l F2 l F3 l not F1 n F2 n F3 n
  • This table makes it possible to understand the dispersion of the characteristic frequencies of the vanes for a given wheel.
  • the rejection or acceptance of the wheel is then determined very simply by classification means 28 by comparing in the table obtained the distribution of these characteristic frequencies with a predetermined set of prohibited frequency distributions, because corresponding to unacceptable configurations at the vibratory level. and determined during the design of the wheel. The identity of the distributions will result in rejection of the controlled wheel.
  • the manufacture of a monobloc bladed wheel generally comprises three successive operations, a milling, a polishing and a shot blasting, and by carrying out the control from the end of the milling step (directly on the machine before dismounting or on a near post), it is possible to avoid the following two steps in the case of a negative control revealing a non-compliant wheel. It also avoids continuing the machining process on the following wheels with the same defects or waiting, as currently, a subsequent geometric control. Note also that the speed of the control allows even to perform it in masked time compared to the machining operation of the next wheel. In this case, the rotation means will of course be directly that used to drive the machine.
  • the method of the invention can not only erroneously discard a wheel likely to have dangerous resonance characteristics, but, for these rejected wheels, it can also determine the nature of the significant defects that affect them to possibly remedy (one on thickness may for example be eliminated by a new local machining) and then lead to a compliant part by comparing its frequency response with respect to predetermined frequency responses characteristic of these standard defects.

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  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
EP01402600.9A 2000-10-10 2001-10-09 Contrôle acoustique de roues aubagées monoblocs Expired - Lifetime EP1205749B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0012926A FR2815123B1 (fr) 2000-10-10 2000-10-10 Controle acoustique de roues aubagees monoblocs
FR0012926 2000-10-10

Publications (2)

Publication Number Publication Date
EP1205749A1 EP1205749A1 (fr) 2002-05-15
EP1205749B1 true EP1205749B1 (fr) 2013-12-04

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EP01402600.9A Expired - Lifetime EP1205749B1 (fr) 2000-10-10 2001-10-09 Contrôle acoustique de roues aubagées monoblocs

Country Status (7)

Country Link
US (1) US6629463B2 (ja)
EP (1) EP1205749B1 (ja)
JP (1) JP4080719B2 (ja)
CA (1) CA2358645C (ja)
FR (1) FR2815123B1 (ja)
NO (1) NO335107B1 (ja)
RU (1) RU2270440C2 (ja)

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Also Published As

Publication number Publication date
NO335107B1 (no) 2014-09-15
US6629463B2 (en) 2003-10-07
RU2270440C2 (ru) 2006-02-20
CA2358645A1 (fr) 2002-04-10
NO20014910D0 (no) 2001-10-09
NO20014910L (no) 2002-04-11
CA2358645C (fr) 2008-12-16
JP4080719B2 (ja) 2008-04-23
US20020059831A1 (en) 2002-05-23
FR2815123B1 (fr) 2003-02-07
JP2002195917A (ja) 2002-07-10
FR2815123A1 (fr) 2002-04-12
EP1205749A1 (fr) 2002-05-15

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